Won't work; it's stupid. Thought they were supposed to be smarter than believers. I've got it, they can call themselves Disciples of Everything Accounted for and Defined (DEAD).
I've only met one atheist who claimed to be so and really was so, he was a very gentle, kind and good man. He would only mention that he was an atheist if it was relevant to the subject being discussed. He was an atheist to his core, but he acted like a Christian should act, and I always thought the world of him.
All the other atheists I met were just a bunch of losers who were mad at God for one reason or another, and in the end could be judged to be bigger believers than professed ones.
Most athiests don't profess their beliefs unless they are asked or it is relevant to the situation. You may have met some that do otherwise, but they are the minority. I am sure you have met many atheists, but didn't realize it because it never "came up."
BTW, there is a woman who I met one time who heard that I was an athiest through a common friend and she tried to use it against me. Luckily the person she tried to use it against me with was a warm, generous person, who worried more about the type of person I am rather than my religions affiliation (or lack there of).